🪵 Mulch Calculator
Convert bed dimensions and desired depth into cubic yards and bag counts to streamline mulching jobs.
Most retail mulch bags contain 2 cubic feet.
How to Use This Calculator
Measure the planting area
Divide complex beds into rectangles or circles and sum the areas.
Choose mulch depth
Apply 2–4 inches for weed suppression and moisture retention.
Plan delivery or pickup
Use cubic yards for bulk delivery or match bag counts at the garden center.
Formula
Volume (cu ft) = Length × Width × Depth ÷ 12
Cubic Yards = Volume ÷ 27
Bags = Volume ÷ Bag Size
Depth in inches is divided by 12 to convert to feet before calculating cubic volume.
Full Description
Mulch protects soil, reduces evaporation, and moderates temperature. Knowing the precise volume prevents shortfalls and limits over-purchasing.
Consider laying landscape fabric or edging before mulch delivery, and plan for settling after heavy rains.
Frequently Asked Questions
How deep should mulch be?
Most beds benefit from 2–3 inches. Avoid piling more than 4 inches near plant stems.
How much does a cubic yard weigh?
Wood mulch averages 400–800 lb per cubic yard depending on moisture and material.
Can I reuse old mulch?
Yes. Rake and fluff existing mulch and top off thin areas with fresh material.
Do I need landscape fabric?
Fabric blocks weeds but can hinder water infiltration. Use selectively or opt for pre-emergent herbicides.